Cubic Silicon Carbide Neural Prosthetic for Biocompatibility
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Solution Overview
Problem
Implantable neuronal prosthetics face reliability issues due to low biocompatibility, leading to immune responses and encapsulation, which results in device failure within months, limiting their use in long-term applications.
Innovation Solution
An implantable neuronal prosthetic is developed using single crystal cubic silicon carbide with a conductive electrode contact and an insulation layer, designed for extended implantation without failure, utilizing chemical-ionic interactions for neural stimulation and signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode materials are used, then electrical signal transmission is achieved, but biocompatibility deteriorates leading to immune response and encapsulation
Solution Approach 1:
The patent changes the material parameter from conventional electrode materials to cubic silicon carbide, which has fundamentally different biocompatibility properties. This material substitution eliminates the immune response and encapsulation issues while maintaining electrical functionality through the conductive coating layer.
Solution Approach 2:
The patent employs a composite structure combining cubic silicon carbide base material with conductive coating layers (such as iridium oxide or platinum). This composite approach leverages the biocompatibility of silicon carbide while adding the electrical conductivity needed for electrode function through the coating layer.
2Object-affected harmful factors
If device biocompatibility is improved to prevent encapsulation, then long-term reliability is enhanced, but device complexity increases due to single crystal material requirements
Solution Approach 1:
The patent extracts the biocompatibility function from the electrode material itself by using cubic silicon carbide as the base, separating it from the conductivity function which is provided by the conductive coating. This functional separation allows each layer to be optimized independently.
Solution Approach 2:
The patent performs preliminary actions by growing the single crystal cubic silicon carbide structure first, then subsequently adding the conductive coating layer. This sequence ensures the biocompatible base structure is established before adding functional layers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The biocompatible and chemically inert cubic silicon carbide prosthetic prevents encapsulation, ensuring long-term reliability and effective neural interaction, enabling extended use and improved performance in bridging neural signals.
Implementation Method 1
Single crystal cubic silicon carbide is a biocompatible, chemically inert, physically strong and elastic semiconducting material
Implementation Method 2
The prosthetic uses the chemical-ionic interaction between the electrodes and the extracellular electrolyte media of the CNS/PNS to electrically stimulate neurons and, in turn, receive the electrochemical signals they generate
Implementation Method 3
An insulation layer consisting of amorphous, polycrystalline, or low temperature deposited crystalline silicon carbide is disposed over the elongated electrode shank
Data Source
AI summary
An implantable neuronal prosthetic and method of manufacture thereof includes at least one elongated electrode shank adapted for arrangement in the brain having at least one electrode contact disposed on its surface and arranged to electrically couple with said brain. The at least one elongated electrode shank is formed form a single crystal cubic silicon carbide. An insulation layer of amorphous, polycrystalline, or single crystal silicon carbide is disposed over the elongated electrode shank; the insulation layer of amorphous, polycrystalline, or single crystal silicon carbide is removed from the at least one electrode contact. Signal control electronics are attached to the at least one elongated electrode shank and are in electrical communication with the at least one electrode contact. In an embodiment, a plurality of the at least one elongated electrode shanks are arranged into a matrix.